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CTS XHP is a powder steel with moderate abrasive edge retention and a useful toughness balance. Its corrosion resistance deserves more attention than its reputation as a high-chromium knife steel might suggest. It can work well for everyday cutting, but it is not the choice to make simply because you want the least possible rust care.
What Is CTS XHP?
CTS XHP is Carpenter's powder metallurgy grade developed from the earlier 440XH alloy. It is sometimes described as stainless D2, but that is shorthand for its development, not a claim that it is the same steel as D2. This profile uses CTS XHP's own composition and ratings.
Performance Ratings
For the science, we turn to Dr. Larrin Thomas of Knife Steel Nerds, who has kindly allowed us to share his ratings here.
| Property | CTS XHP |
|---|---|
| Abrasive edge retention | |
| Toughness | |
| Corrosion resistance |
Heat treatment, hardness and geometry affect actual knives.
Explore CTS XHP’s Tradeoffs
Choose a steel above to highlight its position and see all three exact ratings below. The full map fits your screen.
High-alloy steel; limited corrosion resistance
CTS XHP
- Abrasive edge retention
- 5.5
- Toughness
- 5
- Corrosion resistance
- 6.5
Same position; corrosion ratings may differ:
All 48 rated materials. Numbers group steels at identical coordinates; colors describe stainless classification, not corrosion scores. Neither direction means a universally better knife.
CTS XHP’s ratings are shown above. Enable JavaScript to select another steel, or browse the full ratings table.
Edge Retention and General Cutting
XHP scores 5.5 for abrasive edge retention and 5 for toughness. That places it between more wear-focused choices and steels designed mainly around high toughness. For a pocket knife used for packaging, cord and other mixed cutting, it offers a reasonable material balance if the rest of the knife suits you.
Our S30V profile provides another point of comparison for a stainless everyday-carry knife.
How Much Rust Care Does XHP Need?
Its corrosion-resistance rating is 6.5, lower than many familiar stainless knife steels. Thomas's corrosion testing found weaker performance than its stainless reputation might suggest. The practical takeaway is to give XHP some care rather than assuming its chromium percentage guarantees strong rust resistance.
Clean off salt and food residue, dry the blade after wet use and consider suitable protection during storage in humid conditions. For frequent wet or saltwater cutting, a more corrosion-resistant steel may better match the job.
Sharpening and Edge Maintenance
Suitable conventional sharpening stones can be used for XHP; diamond abrasives are also an option. Start with a grit matched to the work, keep the bevel consistent and remove the burr. Its abrasive edge-retention rating is not a sharpening-time score, so avoid judging the steel from how long one particular repair takes.
For ordinary maintenance, touching up the existing edge removes less metal than changing its angle. If chipping is recurring, review the angle and the cutting task rather than repeatedly sharpening back to the same unsupported edge.
Choosing a CTS XHP Knife
Choose XHP for a knife you like using, with its maintenance needs understood. The blade geometry, handle and maker's heat treatment matter more than the stainless-D2 nickname. If your main concern is corrosion, compare that property explicitly rather than relying on a broad steel category or the amount of chromium in the table. Our knife steel guide explains the wider tradeoffs.
Composition
Our steel composition guide explains what the elements do and how to read these values.
CTS XHP: Carpenter CTS XHP nominal composition, mass %; iron is the balance, not a finished-blade assay. Carpenter Technology: CTS XHP alloy data sheet.
| Element | CTS XHP |
|---|---|
| Carbon (C) | 1.6% |
| Chromium (Cr) | 16% |
| Molybdenum (Mo) | 0.8% |
| Vanadium (V) | 0.45% |
| Nickel (Ni) | 0.35% |
| Manganese (Mn) | 0.5% |
| Silicon (Si) | 0.4% |
